52 DIAPENSIACE.^. Pyxidnnlliera. 



Filaments commonly dilated. Style one : stigma 3-lobed, not indusiate. Ovules 

 indefinite, on projecting axile placentae, anatropous or nearly amphitropous. Cap- 

 sule coriaceous, loculicidally 3-valved, with or without a persistent columella. 

 Embryo small and terete in fleshy albumen ; the cotyledons very short. — Gray, 

 Proc. Am. Acad. viii. 246; Maxim. Mel. Biol. ix. 18; Benth." & Hook. Gen. 

 ii. 618. Dlapensiacece, Lindl., as to our Tribe I., with Galacinem, Don, as to 

 Galax. 

 Tribe I. DTAPENSIE^. Suffruticulose depressed evergreens, crowded with small 



entire and nerveless coriaceous leaves. Sterile filaments or staminodia none : fertile 



filaments adnate to the campauulate corolla up to the sinuses: anthers 2-celled. 



Capsule with persistent columella bearing the placentae. Calyx conspicuously brac- 



teolate, strongly imbricated. Flowers solitary. 



1 PYXIDANTHERA. Flowers sessile on short leafy branchlets. Sepals thin-char- 

 * taceous. Anther-cells "transversely 2-valved, the lower valve cuspidate-pointed. Seeds 



globular, amphitropous, with a close pitted coat. 



2 DIAPENSIA. Flower (or at least fruit) on a scape-Hke peduncle. Sepals broad and 

 ' coriaceous. Aiither-cells muticous, divergent, obliquely 2-valved. Seeds oval or by 



pressure cubical, anatropous, with a nearly close and reticulated coat. 



Tribe II. GALACINE^. Acaulescent, with creeping rootstoclcs sending up long- 

 petioled round-cordate or oblong evergreen leaves, and a scape bearing racemose or 

 clustered or rarely solitary flowers. Staminodia opposite the lobes of the corolla. 

 (Besides the following genera are Schizocodon of Japan, near to Shortia, and Ber- 

 neuxia of Thibet, between the latter and Diapensia.) 



3 SHORTIA Calyx strongly imbricated and scaly-bracteolate ; the sepals many-striate. 

 ■ Corolla open'campanulate, 5-iobed ; the lobes undulate-crenate. Stamens distinct : anthers 



2-celled; the cells obliquely dehiscent: staminodia small and scale-like, adnate to base of 

 corolla, incurved over the ovary. Style filiform : stigma obscurely 3-lobed Capsule 

 globular: partitions borne on the valves and separating from the persistent columella, 

 which bears the placentae. Seeds globular or ovoid with a close granulate coat. 



4 GALAX Calyx rather strongly imbricated, minutely 2-bracteolate, 5-parted ; the oblong 

 divisions nerveless. Corolla of 5 entire oblong petals, distinct, except that their bases 

 are adnate to the base of the monadelphous stamen-tube, which is ovate-cyhndraeeous 

 10-lobed above; the lobes alternate with the petals very short and antheriferous ; those 

 onnosite the petals (i. e. the staminodia) longer, linear-spatulate petaloid : anthers sub- 

 Se 'hlckeSed, rounded and granulate on the back ; the pollimferous part mtrorse and 

 small, somewhat beak-like, one-celled, transversely 2-valyed. Style very short : stigma 

 obscurely 3-lobed. Capsule ovate; the placentiferous columella at length more or less 

 3-parted. Seeds angular, with a loose coat tapering upward. 



1. PYXIDANTHEBA, Michx. Flowering Moss. (77r^<V, a small box. 

 and 'drdlpa, anther, the latter opening as by a lid.) — Fl. i. 152, t. 17 ; Gray, Bot. 

 Text Book, ed. 2, 436, fig. 785-790; Lindl. Veg. Kingd. 606, fig. 410; Hook. 

 Bot. Mag. t. 4592. — Single species. 



P barbulata Michx. A small prostrate and creeping evergreen, leafy throughout, 

 loosely branching : leaves lanceolate or somewhat narrowed below, subulate-acuminate, 

 when young pubescent at base, much crowded, a quarter inch long : flowers abundant (in 

 early spring) closely sessile: corolla white or tinged with rose, open-campanulate ; its 

 lobes (2 lines' long) cuneate-obovate, retuse and obscurely erose : filaments hgulate. -- 

 DiapeLia cmeifolia, Salisb. Parad. Lond. 105; Pursh, Fl. i. 148. D. barbulata, Ell. Sk. 

 i. 229. — Pine barrens, mostly in sand, New Jersey and N. Carolina. 



2. DIAP^INSIA, L. (Said to be an ancient Greek name of Sanicle, some- 

 what altered, applied in a wholly meaningless way to the present genus.) —Arctic- 

 alpine, containing a Himalayan species (Hook. f. Kew. Jour. Bot. ix. t. 12), and 

 the following. 



